I've been using Excel in 2 of my 10G planted tanks for about a month now. I'm not seeing many growth spurts or any pearling. The tanks don't get any other CO2. The plants are mostly Val. spiralis & a few Cryp. wendtii. Is anybody else using this product? Tom Connors, Pittsburgh Pa. I wish I could be half the person our dog "Jed" thinks I am!